Sewing machine



Juy 30, 1935.

G. sAUl-:R 2,009,747

SEWING MACHINE Filed Aug. 2, 1932 4 Sheets-Sheet l Juy 30, 1935. G.sAUER 2,009,747-

SEWING MACHINE Filed Aug. 2, 1932 4 Sheets-Sheet 2 July 30, 1935. G,SAUER 2,009,747

SEWING MACHINE Filed Aug. 2. 1952 4 Sheets-Sheet 3 G SAUER July 3U,1935.

SEWING MACHINE Filed Aug. 2, 1932 4 Sheets-Sheet 4 Patented July so,1935 2,009,747

UNITED STATES PATENT OFFICE SEWING MACHINE George Sauer, Berwyn, Ill.,assigner to Union SpecialMachine Company, Chicago, Ill., a corporationof Illinois Application August 2, 1932', serial' No. 627,234

s claims. (C1. 11a- 209) The invention relates to new and useful imingthe usual supporting brackets on which the provements in a sewingmachine, and more parwork support 2 is mounted. Attached to said bedticularlyto a treadle controlled differential feedand located at oneside of the work support is a ing mechanism which is particularlyadapted for lstandard 3. Mounted for rotation on the stand- ?5 use inconnection With the overedging machine of ard 3 is a main actuatingshaft 4 driven by a belt 5 rthe type shown in the patent granted NormanV. Wheel 5. The needlebar reciprocates in a needle Christensen andFrederick F. Zeier, March 25, head carried by the bracket and isprovided with 1930, fNo. 1,751,508. In this type of machine, the aneedle E. Cooperating Withthe needle beneath main shaft is located abovethe Work support and the Work support is a looper which is mounted infjg extends in the general direction of-the line of a looper carrier/1.Cooperating with the looper 10 feed. The parts beneath the work supportare beneath the work support and the needle above operated by eccentricstraps cooperating with the Work support, is a looper mounted in aicareccentrics onthe main shaft and extending berier 8. The stitchforming mechanism is of the neath the work support. The work supportcharacter shown in the patent granted Frederick fig terminates at ashort distance from the line of F. Zeier and Charles F. Rubel, June 21,1932, No. 15 feed,-so as to provide roo-m for the operation of1,864,393. The looper cooperating with the the Yeccentric straps. Thisgreatly restricts the needle beneath the work supportis actuated byspace in which the feeding mechanism beneath an eccentric strap 9cooperating with an eccentric the worksupport may be located. Y I9 ontheV main shaft 4. The looper which moves An object'of the presentinvention is to provide over the work support is operated by aneccentric 20 a, machine of the above type with a differential strap IIcooperating with an eccentric I2 on the feeding mechanism and a treadlecontrolled means main shaft. -for regulating thelength of-the feedstroke ofthe The material is fed to the needle by a feedingl auxiliaryfeed dog, all of which can be placed bemechanism which includes a mainfeed dog I3 25 heath the work support. Y A and an auxiliary feed dog I4.These feed dogs 25 A further object of the invention is to provideoperate through a throat plate I5 carried by the a differential feeding'mechanism of the above Work support 2. The work support, as shown intype, with a means for regulating the throw of Fig. 2, terminatesadjacent one side of the feed the auxiliary feed dog, which includespositive line which is determined by the feed dogs' I3 "3@ connectionsand few parts. and I4. The machine is particularly designed 30 In thedrawings for operating at the edge of a fabric, and es VFigure 1 is aView partly in section and partly shown, the machine is provided with anoverin side elevation showing a machine embodying edging'mechanism. theinvention; Y Operating on the' material in advance ofthe Fig. 2 is aview partly in plan and partly in stitching point is a trimming blade I6carried 35 section showing the parts immediately beneath bya lever IIwhichk is pivoted at I8. II'he lever the work support, the loopers andparts of the I'I is provided with a stud I''L carrying a ball operatingdevices therefor being omitted for'the with which the eccentric strap I9is connected. sake of clearness, and the outline of the work sup- Thiseccentric strap I9 cooperates with an ec- 40 port being indicated inbroken lines; centricV 26 on the main shaft. The Vmain feed 40 Fig. 3 isa View in perspective showing the difdog; I3 is'rigidly attached to' afeed bar 2 Iv which ferential feeding mechanism and the treadleconextends `to the `rear side of the machine and is trol therefor;pivotallymounted on a pin 22 carried by the Fig. 4 is a sectional viewon the line 4 4 of feed rocker 23 carrying sleeves 24 and 25 in whichFig. 1; 'the pinv is fixed. The' feed rocker 23 is pivotally 45 Fig. 5is a perspective View of the coupling pin mounted' on alpin 236vjournaled in lugs on the bed joining the operating link for theVdifferential I. This feed rocker 23 carries a iorwardlyprofeed dog tothe bracket on the feed rocker; jectingarm 2l which is provided with aball stud Fig. 6 is a sectional view on the line Iif-G of 28. AnYeccentric stralol2!) is connected tothe bali 39 Fig, 2, and stud 28` andcooperates with an eccentric 30 on 50 Fig. '7 is a horizontal sectionalView showing the the` m'an Shaft. ThSpIOVdeS a means whereby ypinconnecting the eccentric strap to the trimmer the mairifeed bar is movedback and forth, 'imlever and the feed bar.' parting a feeding movementto the mainr feed The invention is shown as applied to a sewing dog I3.1 machine whichincludesasupporting bed Icarry- The stud I='I` carries apin 3|, the center of 55 feed bar in the supporting lugs therefor.

which is located nearer the pivotal support I8 for the lever l1 than thecenter of the stud I1, A link 32 is connected to this pin 3l and to apin 33 attached to the feed bar 2|. When the lever I1 is raised andlowered for the trimming of the fabric, the feed bar is also raised andlowered, but the up and down movements imparted to the feed bar are lessthan the reciprocating movements of the trimmer. The feed dog carried bythe feed bar moves into engagement with the fabric and lifts the same,while the trimmingY blade passes through and cuts the fabric. Thisprovides a means whereby ample trimming stroke may be given to thetrimming blade without imparting an excessive stroke to the feed bar forraising and lowering the feed dog.

The auxiliary feed dog i4 is secured to a bracket 34 by means of a screw35. This bracket 34 is attached to the forward end of the auxiliary feedbar 35. This auxiliary feed bar 36 is cylindrical in shape, and isvmounted for reciprocation in spaced lugs 31 and 38 carried by the mainfeed bar. Located on the auxiliary feed bar between the spaced lugs 31and 38 is Va block 39. The block 39 carries a pin 40 which extendsthrough a slot in the main feed bar 2|. 'Ihis main feed bar carriesguide plates 42, 42, between which the pin 46 is guided. The purpose ofthis pin and the guide plates is to maintain the auxiliary feed barhorizo-ntal and prevent any angular or twisting movement of theauxiliary The block 39 is provided with a pin 43 with which a link 44 isconnected. This link imparts reciprocations to the auxiliary feed bar.This particular mounting for the auxiliary feed bar and the operatingconnection thereof forms no part of the present invention per se, but isshown, described and claimed in the application of Frederick F. Zeierand Clarence C. Smith, filed November 5, 1930, Serial No. 493,648.

The link 44 is provided with forks 45 and 46 which are spaced andreceive therebetween a bracket arm 41 formed integral with the feedrockerk 23. This bracket arm is provided with a slot 48. A pin 49 havinga cylindrical head 50 and a flat-sided portion 5 l, and also acylindrical portion of reduced diameter 52, serves as a connecting meansbetween the forked end of the link 44 and this bracket arm 41.Thecylindrical portion 50 of the pin is housed within the fork 45,theflat-sided portion 5l of the pin is housed within the bracket, andthe reduced cylindrical portion 52 extends thro-ugh the fork 46 andprojects therefrom. Y

A link 53 is pivotally connected to the projecting portion of the pin atits upper end, and is secured to the pin by a screw 54 threaded into theend of the pin. The lower end of the link 53 is pivoted Vat 55 to alever 56. The lever 56 is mounted on a fulcrum support 51 carried by abracket 58 attached to the bed of the machine. The lever lies beneaththe work support and extends to the front of the machine. A flexiblechain or the like 59 is connected to the free end of the lever, and to asuitable treadle or knee shift for operating said lever. A spring 60encircles the fulcrum support for the lever and bears at one end againstthe bed and at its other end against the lever, and normally tends toturn the lever in a counter-clockwise direction as viewed in Fig. 1. Thebracket 62 secured by. screws 63, 63 to the bed of the machine, extendsup alongside of the lever 56. This bracket'is slotted at 64, and isprovided with two stop lugs throw of the auxiliary feed dog.

65 and 66, one above and the other below the free end of the lever 56.These studs may be shifted in the slot to different set positions. Whenthe treadle is released, the free end of the lever will be raised by thespring until the lever contacts with the lug 66. This will place the pin49 to which the link 44 is attached at a definite set position in theslot in the bracket arm 41. When the treadle is depressed, and the freeend of the lever moves into contact with the stop lug 65, and the pin 49will be raised in the slot 4B of the bracket arm 41. This will increasethe By shifting these stop lugs, the desired throw of the auxiliary feeddog relative to the main feed dog may be obtained. When the pin 49 is atthe lower end between the main feed bar and the feed rocker, that thefeed dogs will move substantially in unison. By depressing the treadlewithout stopping the machine, the stroke of the auxiliary feed dog maybe increased, Yand when the treadle is released, the stroke of theauxiliary feed dog will be shortened.

Cooperating with both the main and the auxiliary feed dog is a presserfoot 61 carried by a lever 68 pivotally supported on the standard. Saidpresser foot is yieldingly moved into contact with the material by aplunger 69 which is spring-pressed.

From the above it will be noted that the main feed shaft extends in thegeneral direction of the line of feed, although at an acute anglethereto. The axis of the main shaft lies substantially in the line a, aof Fig. 2, while the feed is in the direction of the arrow shown in thisfigure. The work support terminates at a short distance from the line offeed. The machine is particularly designed for stitching along the edgeof a fabric, and therefore, it is not necessary to extend the worksupport any great distance to the right of the trimming line, as viewedfrom the front of the machine. The operating eccentric straps for thepart beneath the work support pass down along the side of the worksupport. The feeding mechanism is all beneath the work support andconsists of very few parts positively connected. The control lever forthe auxiliary feed dog is likewise beneath the work support. By thissimplified arrangement of the control means and the operating parts Vforthe auxiliary feed dog, a feeding mechanism has been provided for thisparticular type of machine, rso that a differential feeding action maybe obtained whenever desired.

It is obvious that minor changes in the arrangement of parts and thedetails of construction may be made without departing from the spirit ofthe invention as set forth in the appended claims.

Having thus described the invention, what I claim as new anddesire tosecure by Letters Pat-- ent, is-

l. A sewing machine comprising in combination a supporting bed, a worksupport carried thereby, a standard at one side of said work support, amain shaft mounted on said standard and extending in the generaldirection of the line of feed, a differential feeding mechanism locatedybeneath the work support` and including a main feed bar, a main feeddog carried thereby, an auxiliary feed bar, an auxiliary feed dogcarried thereby, means for reciprocating said feed dogs and imparting tothe auxiliary feed dog a differential-lmovement including a shiftablelink VVfor varying the throw of theauxiliary feed dog, said means beingoperated from said main shaft above the worksupport, means operated fromsaid main shaft for raising and lowering said feed bar, andtreadle-controlled means located beneath the work support for varyingthe stroke Aof the auxiliary feed dog including a lever pivotedintermediate its ends and having a direct connection at one end to saidshiftable link andy atits other end to a treadle.

1 2. A sewing machine comprising in combination supporting bed, a worksupport carried thereby, a standard at one side of said work support, amain shaft mounted on said standard and extending in the generaldirection of the line of feed', a differential feeding mechanism locatedbeneath the work support and including a main feed bar, a main feed dogcarried thereby, an auxiliary feed bar, an auxiliary feed dog carriedthereby, means operated from said main shaft for raising and loweringsaid feed bar, a feed rocker to which said main feed bar is connected,means operated by the main shaft and connected yto said feed rocker foroscillating the same, a

bracket arm carried by the feed rocker, a link having a shiftableconnection with the bracket arm and connected to the auxiliary feed barfor reciprocating the same, and a treadle-controlled means locatedbeneath the work support for varying the stroke of the auxiliary feeddog, including a lever pivoted intermediate its ends and connected atone end to said shiftable link and at its other end to a treadle.

3. A sewing machine comprising in combination a supporting bed, a worksupport carried thereby, a standard at one side of said work support, amain shaft mounted on said standard and extending in the generaldirection of the line of feed, a differential feeding mechanism locatedbeneath the work support and including a main feed bar, a main feed dogcarried thereby, an auxiliary feed bar, an auxiliary feed dog carriedthereby, means operated from said main shaft for raising and loweringsaid feed bar, a feed rocker to which said main feed bar is connected,means operated by the main shaft and connected to said feed rocker foroscillating the same, a bracket arm carried by the feed rocker, a linkhaving a shiftable connection with the bracket arm and connected to theauxiliary feed bar for reciprocating the same, a lever mounted beneaththe Work support to one end of which the treadle is adapted to beconnected, and a link connected to the other end of said lever andoperating to shift the actuating link for the auxiliary feed bar todifferent set positions on the bracket arm.

fi. A sewing machine comprising in combination a supporting bed, a worksupport carried thereby, a standard at one side of said work support, amain shaft mounted on said standard and extending in the generaldirection of the line of feed, a differential feeding mechanism locatedbeneath the work support and including a main feed bar, a main feed dogcarried thereby, an auxiliary feed bar, an auxiliary feed dog carriedthereby, means operated from said main shaft for raising and loweringsaid feed bar, a feed rocker to which said main feed bar is connected,an arm projecting from said feed rocker, means actuated by the mainshaft and connected to said arm for oscillating the feed rocker, aslotted bracket arm carried by the feed rocker, a link pivoted to theauxiliary feed bar and having a forked end straddling the bracket arm, apin extendingv froml said forked endfof thevlinkland through thef'slotin said bracket arm, `a IlinkV con'- nected to said pin,andja"leverwte'one' end l `ci' which said last-named vlink'is connected atftheother end-,the other-'end of said lever being adapt# ed tofbeconnectedtofaltreadle whereby'said lever may be manually shifted to'move the-pinto different set positions on the bracket arm for varying the throwofthe auxiliary feeddo'g.

5. A sewing machine comprising irr'combina'- tion a supporting bed, awork support?carried thereby, a standard at one'side of said worksnpport,\a main shaft mounted on said standard and extending in the generaldirection lof the linefo'f feed, a differential 'feeding-mechanismlocated beneath the work support andincludingfa` main feed bar, a mainfeeddog carriedthereby, Ean aux# iliary feed bar, an auxiliary feed dogcarried thereby, means operated from said main shaft for raising andlowering said feed bar, said main feed bar having spaced lugs in whichsaid auxiliary feed bar is mounted for reciprocation, meansforpreventing said auxiliary feed bar from oscillating in said lugs, a linkpivoted to the auxiliary feed bar intermediate said spaced lugs, a feedrocker to which said main feed bar is pivotally connected, a slottedbracket arm carried by the feed rocker to which said link is shiftablyconnected, and treadle-controlled means for shifting said link todifferent set positions.

6. A sewing machine comprising in combination a supporting bed, a worksupport carried thereby, a standard at one side of said work support, amain shaft mounted on said standard and extending in the generaldirection of the line of feed, a differential feeding mechanism locatedbeneath the work support and including a main feed bar, a main feed dogcarried thereby, an auxiliary feed bar, an auxiliary feed dog carriedthereby, means operated from said main shaft for raising and loweringsaid feed bar,*said main feed bar having spaced lugs in which saidauxiliary feed bar is mounted for reciprocation, means for preventingsaid auxiliary feed bar from oscillating in said lugs, a link pivoted tothe auxiliary feed bar intermediate said spaced lugs, a feed rockerto'which said main feed bar is pivotally connected, a slotted bracketarm carried by the feed rocker to which said link is shiftablyconnected, a lever located beneath the work support and adapted to beconnected to a treadle, and a link connected to said lever and to thefirstnamed link for shifting the connection thereof to the bracket armto different set positions.

7. A sewing machine comprising in combination a supporting bed, a worksupport carried thereby, a standard at one side of said work support, amain shaft mounted on said standard and extending in the generaldirection of the line of feed, a differential feeding mechanism locatedbeneath the work support and including a main feed bar, a main feed dogcarried thereby, an auxiliary feed bar, an auxiliary feed dog carriedthereby, means operated from said main shaft for raising and loweringsaid feed bar, said main feed bar having spaced lugs in which saidauxiliary feed bar is mounted for reciprocation, means Y alinkconnectedVto said'lever and tothe firstnamed 'link for shifting the connection.thereof to the bracket arm to different set positions, a spring formoving said lever inonedirection, and spaced strop lugsfor limiting`rthe movement of said lever and for determining'the 4set position of Athe connection between therlinkv and the bracket arm.

8. A sewing machinevcomprising in combination amsupporting bed, a worksupport carried thereby, a mainfeeld bar located beneath the Worksupport, a feed dog carried thereby, means for raising and loweringlsaid main feed bar,l a feed rocker to which lsaid main feed bar isconnected for imparting feeding `movements to the feed dog, an auxiliaryfeed bar, means for raising and lowering said auxiliary feed bar intiming with said main feed bar,: means connecting said auxiliary feedbar to said feed rocker for moving said auxiliary feed bar end wiseandimparting feeding movements tothe auxiliary feed dog including ashiftable link whereby the extent of movement imparted to the auxiliaryfeed dog may be varied, a lever located beneath the work support andextending from a point adjacent the feedrocker to a point adjacent thefront of the machine, means for pivotally supporting the leverintermediate its ends, means for directly connecting the rear end ofsaid lever to said link for shifting the same and a flexible meansconnected to theother end of said lever and adapted to be connected to atreadle whereby said lever may be shifted. y l Y l y GEORGE SAUER.

